a solid wood door 90 cm wide by 2.00 m tall has a mass of 35.0 kg. it is ajar and at rest. a ball with a mass of 500 g is thrown perpendicular to the door with a speed of 20.0 m/s and hits the door 60.0 cm from the hinged side. the ball rebounds with a speed of 16.0 m/s along the same line. how much energy is lost in the process?